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en.wikipedia.org/wiki/Coral_reef

Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures ..... when ocean waters are warm, poor, clear and agitated, a fact which Darwin had already noted when he passed through Tahiti in 1842.

www.defenders.org/coral-reef/basic-facts

Coral reefs are some of the most diverse ecosystems in the world, housing tens of thousands of marine species. About one-third of all marine fish species live ...

www.coral-reef-info.com

Facts and information about coral reefs; including reef structure, marine life, and distribution.

ocean.si.edu/corals-and-coral-reefs

Corals, sponges and seaweeds cover most of the surface of many coral reefs. Credit: Wolcott Henry. Coral reefs are the most diverse of all marine ecosystems.

kids.nceas.ucsb.edu/biomes/coralreef.html

LOCATION: Coral reefs are generally found in clear, tropical oceans. .... Surf the Internet for information about coral reefs and marine conservation organizations.

wwf.panda.org/about_our_earth/blue_planet/coasts/coral_reefs

Coral reefs are home to 25% of all marine life on the planet. In fact the variety of life supported by coral reefs rivals that of the tropical forests of the Amazon or ...

www.conserve-energy-future.com/top-25-coral-reef-facts.php

Fact 2: A coral reef isn't a “thing,” it's actually a community of life that lives and thrives in one location. What we think of as the base of the reef (and what we see  ...

www.livescience.com/40276-coral-reefs.html

Oct 8, 2013 ... Coral reefs are large underwater structures composed of the skeletons of coral, which are marine invertebrate animals.

www.nationalgeographic.com/animals/invertebrates/group/corals

Meet the tiny organisms that combine to create the world's great tropical reefs. Find out about the threats that imperil corals worldwide.